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<div id="unreleased-message"> You are reading an old version of the documentation (v2.2.4). For the latest version see <a href="https://matplotlib.org/stable/gallery/units/units_sample.html">https://matplotlib.org/stable/gallery/units/units_sample.html</a></div>

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<span id="sphx-glr-gallery-units-units-sample-py"></span><h1>Inches and Centimeters<a class="headerlink" href="#inches-and-centimeters" title="Permalink to this headline">¶</a></h1>

<p>The example illustrates the ability to override default x and y units (ax1) to

inches and centimeters using the <code class="xref py py-obj docutils literal notranslate"><span class="pre">xunits</span></code> and <code class="xref py py-obj docutils literal notranslate"><span class="pre">yunits</span></code> parameters for the

<code class="xref py py-obj docutils literal notranslate"><span class="pre">plot</span></code> function. Note that conversions are applied to get numbers to correct

units.</p>

<p>This example requires <a class="reference download internal" download="" href="../../_downloads/ed936b25273390c4c08ea9b52bc95351/basic_units.py"><code class="xref download docutils literal notranslate"><span class="pre">basic_units.py</span></code></a></p>

<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">basic_units</span> <span class="kn">import</span> <span class="n">cm</span><span class="p">,</span> <span class="n">inch</span>

<span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="kn">as</span> <span class="nn">plt</span>

<span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">as</span> <span class="nn">np</span>

<span class="n">cms</span> <span class="o">=</span> <span class="n">cm</span> <span class="o">*</span> <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.arange.html#numpy.arange" title="View documentation for numpy.arange"><span class="n">np</span><span class="o">.</span><span class="n">arange</span></a><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>

<span class="n">fig</span><span class="p">,</span> <span class="n">axs</span> <span class="o">=</span> <a href="../../api/_as_gen/matplotlib.pyplot.subplots.html#matplotlib.pyplot.subplots" title="View documentation for matplotlib.pyplot.subplots"><span class="n">plt</span><span class="o">.</span><span class="n">subplots</span></a><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>

<span class="n">axs</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">cms</span><span class="p">,</span> <span class="n">cms</span><span class="p">,</span> <span class="n">xunits</span><span class="o">=</span><span class="n">cm</span><span class="p">,</span> <span class="n">yunits</span><span class="o">=</span><span class="n">inch</span><span class="p">)</span>

<span class="n">axs</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">cms</span><span class="p">,</span> <span class="n">cms</span><span class="p">,</span> <span class="n">xunits</span><span class="o">=</span><span class="n">inch</span><span class="p">,</span> <span class="n">yunits</span><span class="o">=</span><span class="n">cm</span><span class="p">)</span>

<span class="n">axs</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">set_xlim</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">6</span><span class="p">)</span> <span class="c1"># scalars are interpreted in current units</span>

<span class="n">axs</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">cms</span><span class="p">,</span> <span class="n">cms</span><span class="p">,</span> <span class="n">xunits</span><span class="o">=</span><span class="n">inch</span><span class="p">,</span> <span class="n">yunits</span><span class="o">=</span><span class="n">inch</span><span class="p">)</span>

<span class="n">axs</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">set_xlim</span><span class="p">(</span><span class="mi">3</span><span class="o">*</span><span class="n">cm</span><span class="p">,</span> <span class="mi">6</span><span class="o">*</span><span class="n">cm</span><span class="p">)</span> <span class="c1"># cm are converted to inches</span>

</pre></div>

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<a class="reference download internal" download="" href="../../_downloads/028240136e7e8548a6cf675939127c36/units_sample.py"><code class="xref download docutils literal notranslate"><span class="pre">Download</span> <span class="pre">Python</span> <span class="pre">source</span> <span class="pre">code:</span> <span class="pre">units_sample.py</span></code></a></div>

<a class="reference download internal" download="" href="../../_downloads/4db9d0a9fc54d2a0fd77135d6fcdc4f0/units_sample.ipynb"><code class="xref download docutils literal notranslate"><span class="pre">Download</span> <span class="pre">Jupyter</span> <span class="pre">notebook:</span> <span class="pre">units_sample.ipynb</span></code></a></div>

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